Question: It's found that the mean and standard deviation in the fluoride concentration in a water treatment plant are 1.18 ppm and 0.27 ppm, respectively.

It's found that the mean and standard deviation in the fluoride concentration

It's found that the mean and standard deviation in the fluoride concentration in a water treatment plant are 1.18 ppm and 0.27 ppm, respectively. If we sample the water from the plant, calculate the probability that the fluoride concentration is: (a) Larger than 1.45 ppm. (3 marks) (b) Between 0.729 and 1.091 (4 marks) (c) Smaller than 0.729 (3 marks)

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